HD64F36077GHV Renesas Electronics America, HD64F36077GHV Datasheet - Page 105

• Manufacturer Part Number: HD64F36077GHV
• Description: 16BIT MCU FLASH 56K, SMD, LQFP64
• Manufacturer: Renesas Electronics America

Specifications of HD64F36077GHV

• No. Of I/o's: 47
• Ram Memory Size: 4KB
• Cpu Speed: 20MHz
• No. Of Timers: 4
• Digital Ic Case Style: LQFP
• Supply Voltage Range: 4.5V
• Core Size: 16bit
• Program Memory Size: 56KB
• Oscillator Type: External Only
• Controller Family/series: H8/300H
• Peripherals: ADC
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

5.3
Figure 5.2 shows the state transition of the system clock.
5.3.1
The LSI system clock is generated by the on-chip oscillator clock after a reset. The system clock
sources are switched from the on-chip oscillator to the external clock by the user software. Figure
5.3 shows the flowchart to switch clocks with the external clock backup function enabled. Figures
5.4 and 5.5 show the flowcharts to switch clocks with the external clock backup function disabled.
Note: * Conditions for the state transition are as follows:
On-chip oscillator: Halted
External oscillator: Operated
System Clock Select Operation
Clock Control Operation
Reset state
When the external oscillator halt is detected while the backup function is enabled
When the external clock is switched to the on-chip oscillator clock by user software
while the backup function is disabled
Figure 5.2 State Transition of System Clock
Reset release
Oscillator operated
Oscillator halted
LSI operates on on-chip oscillator clock
LSI operates on external oscillator
Rev. 1.00 Sep. 16, 2005 Page 75 of 490
On-chip oscillator: Operated
External oscillator: Halted
On-chip oscillator: Operated
External oscillator: Operated
Section 5 Clock Pulse Generator
*
Switching to
external clock
REJ09B0216-0100